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Date:	Wed, 21 Apr 2021 11:19:57 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: Cannot access system32 directory from 32 bit cygwin after the
	commit 456c3a46
Message-ID:	<YH/uPeBvTfxKdRxQ@calimero.vinschen.de>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Hi Takashi,

On Apr 21 12:04, Takashi Yano via Cygwin wrote:
> Hi Corinna,
> 
> I noticed the problem that /cygdrive/c/Windows/System32 directory
> can be no longer accessed from 32 bit cygwin (WOW64) after the
> commit:

The problem here is the File System Redirector,
https://docs.microsoft.com/en-us/windows/win32/winprog64/file-system-redirector

This thing is really a problem because it break every, otherwise
sane assumption.  Hmm, bummer.  I need some time to think about
a solution here.


Thanks,
Corinna

> 
> commit 456c3a46386f38887407603b2c64b7f63a4871c5
> Author: Corinna Vinschen <corinna AT vinschen DOT de>
> Date:   Mon Apr 19 14:49:14 2021 +0200
> 
>     Cygwin: path_conv: Try to handle native symlinks more sanely
> 
>     For local paths, add a check if the inner path components contain native
>     symlinks or junctions.  Compare the incoming path with the path returned
>     by NtQueryInformationFile(FileNameInformation).  If they differ, there
>     must be at least one native symlink or junction in the path.  If so,
>     treat the currently evaluated file as non-existant.  This forces
>     path_conv::check to backtrack inner path components until we eliminated
>     all native symlinks or junctions and have a normalized path.
> 
>     Signed-off-by: Corinna Vinschen <corinna AT vinschen DOT de>
> 
> Reverting this commit resolves the issue.
> 
> 64 bit cygwin does not seem to be affected. Could you please
> have a look?
> 
> -- 
> Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
> 
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